[Buildbot-devel] Step fails only under Buildbot

[Pierre Tardy]

valgrind also can help detect issues with pointers.

Pierre


On Sat, Mar 8, 2014 at 2:31 PM, Bob Hood <bhood2 at comcast.net> wrote:

> On 3/8/2014 6:23 AM, Dustin J. Mitchell wrote:
> >
> > Signal 11 can be really tricky to track down, too.  It might depend on
> > something as trivial as the length of an unrelated string that shifts the
> > memory allocation pattern slightly.
> >
> > If you can reliably reproduce it within the Buildbot environment, then
> > reproducing outside that environment may not provide you with much more
> > information.  Using debugging mallocs or adding debugging information as
> > others have suggested may be a better approach.  The risk is that even
> these
> > changes will make the failure go away.
> >
> > If that happens, fuzzing is also an option - running repeatedly with
> > randomized inputs until failure.
> >
>
> Hi, Dustin.
>
> I did as Stephen suggested, and added the GuardMalloc library to the
> execution.  It produced no actual diagnostic output (beyond the header that
> indicated its presence), but the step actually completed successfully with
> its
> inclusion.
>
> It does indeed "feel" like a pointer issue, however, as long as GuardMalloc
> gets me past the step, I can let the rest of the build complete while we
> try
> to track down the actual issue.
>
> Let me extend my thanks to everybody for their input on this problem.
>
>
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